:root{
  --bg:#ECEDEF;
  --panel:#F7F7F8;
  --ink:#1B1D22;
  --muted:#5F636D;
  --line:#D3D5DA;
  --accent:#2F4B8A;
  --accent-ink:#FFFFFF;
  --focus:#2F4B8A;
  --hover:rgba(127,127,127,.12);
  --accent-soft:color-mix(in srgb, var(--accent) 14%, transparent);
  --display:"Bricolage Grotesque", "Helvetica Neue", Arial, sans-serif;
  --body:"Instrument Sans", system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono:"IBM Plex Mono", ui-monospace, Menlo, Consolas, monospace;
}
@media (prefers-color-scheme: dark){
  :root{
    --bg:#15171B; --panel:#1D2026; --ink:#E7E8EB; --muted:#9CA1AB; --line:#30343C;
    --accent:#8FA8E6; --accent-ink:#10131A; --focus:#8FA8E6; color-scheme:dark;
  }
}
*{box-sizing:border-box}
/* `hidden` must win over any display set by a class (e.g. .field is flex) */
[hidden]{display:none!important}
body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--body);font-size:15px;line-height:1.5}

/* ---------- app shell: sidebar + content ---------- */
.app{display:grid;grid-template-columns:232px minmax(0,1fr);min-height:100vh}
.sidebar{position:sticky;top:0;height:100vh;overflow-y:auto;background:var(--panel);border-right:1px solid var(--line);padding:20px 12px;display:flex;flex-direction:column;gap:24px}
.brand{display:flex;align-items:center;gap:10px;padding:2px 8px;color:var(--ink);text-decoration:none;font-family:var(--display);font-weight:700;font-size:21px;letter-spacing:-.015em;line-height:1}
.brand img{width:32px;height:auto;flex:none}
.nav-h{font-size:11px;font-weight:600;text-transform:uppercase;letter-spacing:.09em;color:var(--muted);margin:0 0 6px;padding:0 10px}
.sidebar ul{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:2px}
.sidebar nav a{display:flex;align-items:center;gap:10px;padding:8px 10px;border-radius:8px;color:var(--ink);text-decoration:none;font-weight:500;font-size:14.5px}
.sidebar nav a:hover{background:var(--hover)}
.sidebar nav a[aria-current="page"]{background:var(--accent-soft);color:var(--accent);font-weight:600}
.sidebar-foot{margin:auto 0 0;padding:0 10px;font-size:12.5px;line-height:1.4;color:var(--muted)}
a:focus-visible{outline:2px solid var(--focus);outline-offset:2px;border-radius:8px}
.topbar{display:none}
.icon-btn{display:grid;place-items:center;width:38px;height:38px;padding:0}
.scrim{position:fixed;inset:0;z-index:15;background:rgba(10,12,16,.45)}
@media (max-width:1023px){
  .app{grid-template-columns:minmax(0,1fr)}
  .sidebar{position:fixed;inset:0 auto 0 0;z-index:20;width:min(280px,85vw);box-shadow:0 0 40px rgba(0,0,0,.25);
    transform:translateX(-100%);visibility:hidden;transition:transform .22s ease,visibility 0s .22s}
  .sidebar.open{transform:none;visibility:visible;transition:transform .22s ease}
  .topbar{display:flex;align-items:center;gap:10px;position:sticky;top:0;z-index:10;padding:10px 16px;background:var(--panel);border-bottom:1px solid var(--line)}
  .topbar .brand{font-size:19px;padding:0}
  .topbar .brand img{width:26px}
  .icon-btn .icon{width:20px;height:20px}
}

/* ---------- tool page ---------- */
/* Breakpoints below follow the content width, not the viewport, since the sidebar takes a share of it. */
.content{container-type:inline-size;min-width:0}
.wrap{max-width:1180px;margin:0 auto;padding:28px 20px 48px}
header{display:flex;flex-wrap:wrap;align-items:flex-end;justify-content:space-between;gap:12px 24px;margin-bottom:22px}
h1{font-family:var(--display);font-weight:700;font-size:clamp(28px,4.4vw,44px);line-height:1.02;letter-spacing:-.02em;margin:0;text-wrap:balance}
.lede{color:var(--muted);margin:6px 0 0;max-width:56ch}
.actions{display:flex;gap:8px;flex-wrap:wrap}
button{font:inherit;cursor:pointer;border-radius:8px;border:1px solid var(--line);background:var(--panel);color:var(--ink);padding:9px 14px;font-weight:500}
button:hover{border-color:var(--muted)}
.actions button{display:inline-flex;align-items:center;justify-content:center;gap:7px}
button.primary{background:var(--accent);color:var(--accent-ink);border-color:var(--accent);font-weight:600}
button:focus-visible,input:focus-visible,select:focus-visible{outline:2px solid var(--focus);outline-offset:2px}
kbd{font-family:var(--mono);font-size:11px;border:1px solid currentColor;border-radius:4px;padding:0 4px;opacity:.75;margin-left:6px}
/* Lucide icons from /icons.svg; stroke styles live here, not in the sprite */
.icon{width:16px;height:16px;flex:none;fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round;stroke-linejoin:round}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}

.layout{display:grid;grid-template-columns:280px 1fr;gap:20px;align-items:start}
@container (max-width:860px){
  .layout{grid-template-columns:1fr}
  /* Settings sit above the palette, collapsed into a toggle; open, they scroll
     inside a capped height so part of the palette stays in view. */
  .layout .controls{padding:0;gap:0}
  .controls .controls-title{display:none}
  .controls .controls-toggle{display:flex}
  .controls .controls-body{display:none;padding:14px 16px 18px;max-height:50vh;overflow-y:auto;overscroll-behavior:contain}
  .controls.open .controls-body{display:flex}
  .controls.open .controls-toggle{border-bottom:1px solid var(--line);border-radius:12px 12px 0 0}
  .controls.open .chevron{transform:rotate(180deg)}
}
@container (max-width:620px){
  .actions{display:grid;grid-template-columns:1fr 1fr;width:100%}
  #gen{grid-column:1/-1;order:-1}
}
/* no keyboard shortcut to advertise on touch screens */
@media (hover:none){kbd{display:none}}

.controls{background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:18px;display:flex;flex-direction:column;gap:16px}
.controls h2,.section-h{display:inline-flex;align-items:center;gap:6px;font-family:var(--body);font-size:11px;font-weight:600;text-transform:uppercase;letter-spacing:.09em;color:var(--muted);margin:0}
.controls-body{display:flex;flex-direction:column;gap:16px}
.controls-toggle{display:none;align-items:center;justify-content:space-between;width:100%;padding:12px 16px;border:0;border-radius:12px;background:none;font-weight:600}
.controls-toggle span{display:inline-flex;align-items:center;gap:8px}
.controls-toggle .chevron{transition:transform .2s ease}
.field{display:flex;flex-direction:column;gap:6px}
.field label{display:flex;justify-content:space-between;gap:8px;font-weight:500;font-size:14px}
.field output{font-family:var(--mono);font-size:13px;color:var(--muted);font-variant-numeric:tabular-nums}
.hint{font-size:12.5px;color:var(--muted);line-height:1.4}
.check + .hint{margin-top:-10px}
select{font:inherit;padding:8px 10px;border-radius:8px;border:1px solid var(--line);background:var(--bg);color:var(--ink)}
input[type=range]{width:100%;accent-color:var(--accent)}
.check{display:flex;gap:8px;align-items:center;font-size:14px}
.check input{accent-color:var(--accent);width:16px;height:16px}
hr{border:0;border-top:1px solid var(--line);margin:0}

.main{display:flex;flex-direction:column;gap:20px;min-width:0}
.cards-bar{display:flex;justify-content:flex-end;gap:8px;margin-bottom:-10px}
.toggle-pill{display:inline-flex;align-items:center;gap:7px;padding:6px 12px;border:1px solid var(--line);border-radius:999px;background:var(--panel);font-size:13.5px;font-weight:500;cursor:pointer;user-select:none}
.toggle-pill:hover{border-color:var(--muted)}
.toggle-pill:has(input:checked){border-color:var(--accent);background:var(--accent-soft);color:var(--accent)}
.toggle-pill input{margin:0;accent-color:var(--accent)}
.swatches{display:grid;grid-auto-flow:column;grid-auto-columns:1fr;gap:6px;min-height:300px}
.sw{position:relative;border-radius:10px;display:flex;flex-direction:column;justify-content:space-between;padding:12px 10px;min-width:0;transition:background-color .25s}
.sw .v{font-family:var(--display);font-weight:700;font-size:clamp(22px,3vw,34px);line-height:1;font-variant-numeric:tabular-nums}
.sw .vlab{font-size:10.5px;text-transform:uppercase;letter-spacing:.08em;opacity:.8;margin-bottom:4px}
.sw .bottom{display:flex;flex-direction:column;gap:6px;align-items:flex-start}
.sw .hex{font-family:var(--mono);font-size:12.5px;background:none;border:0;padding:2px 0;color:inherit;text-align:left}
.sw .hex:hover{text-decoration:underline}
.sw .value-range{display:block;width:100%;margin:14px 0 0;accent-color:currentColor;cursor:pointer}
.sw .value-range:disabled{opacity:.35;cursor:not-allowed}
.sw .tools{display:flex;gap:6px}
.sw .tool{display:grid;place-items:center;width:32px;height:32px;padding:0;border-radius:7px;background:rgba(127,127,127,.18);border:1px solid transparent;color:inherit}
.sw .tool:hover{background:rgba(127,127,127,.3);border-color:transparent}
.sw .tool:disabled{opacity:.35;cursor:not-allowed}
.sw .tool:disabled:hover{background:rgba(127,127,127,.18)}
.sw .lock[aria-pressed="true"]{border-color:currentColor;background:rgba(127,127,127,.32)}
.sw .role{font-size:12px;opacity:.85;line-height:1.3}
@container (max-width:620px){
  .swatches{grid-auto-flow:row;grid-auto-rows:minmax(64px,auto);min-height:0}
  .sw{flex-direction:row;align-items:center;gap:12px;padding:10px 12px}
  .sw .top{flex:1;min-width:0}
  .sw .value-range{max-width:180px;margin-top:6px}
  .sw .bottom{flex-direction:row;align-items:center;gap:10px}
  .sw .role{display:none}
}

.grey{display:grid;grid-auto-flow:column;grid-auto-columns:1fr;height:34px;border-radius:8px;overflow:hidden;border:1px solid var(--line)}
.gray-wrap{display:flex;flex-direction:column;gap:8px}
.warn{font-size:13px;color:var(--muted)}
.warn strong{color:var(--ink)}

.lower{display:grid;grid-template-columns:minmax(0,1.1fr) minmax(0,1fr);gap:20px}
@container (max-width:760px){.lower{grid-template-columns:1fr}}
.card{background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:16px;display:flex;flex-direction:column;gap:12px;min-width:0}
canvas{width:100%;height:auto;border-radius:8px;display:block;max-width:100%}
.row{display:flex;justify-content:space-between;align-items:center;gap:10px;flex-wrap:wrap}
.hist{display:flex;flex-direction:column;gap:8px}
.hist button{display:grid;grid-auto-flow:column;grid-auto-columns:1fr;height:30px;padding:0;overflow:hidden;border-radius:6px}
.hist button span{display:block;height:100%}
.hist .empty{color:var(--muted);font-size:13px}
.tips{margin:0;padding-left:18px;color:var(--muted);font-size:13.5px;display:flex;flex-direction:column;gap:4px}
.toast{position:fixed;left:50%;bottom:calc(20px + env(safe-area-inset-bottom,0px));transform:translateX(-50%);background:var(--ink);color:var(--bg);padding:8px 14px;border-radius:8px;font-size:14px;opacity:0;pointer-events:none;transition:opacity .2s}
.toast.show{opacity:1}
@media (prefers-reduced-motion:reduce){.sw,.toast,.sidebar,.sidebar.open,.controls-toggle .chevron{transition:none}}